In the resume, it says 'manual management of message offsets' — what does it mean?

Handling message processing with manual offset management typically relates to working with message queue systems or streaming platforms, such as Kafka.

In such systems, offset is the position in the message stream that indicates the last processed message. Manual offset management means that the application controls when and which offset is considered acknowledged (committed).

This provides flexibility:

• Ensuring messages are not lost or processed multiple times.
• Allowing rollback to previous offsets in case of errors.
• Managing the order of message processing and acknowledgment.

For example, in Kafka, a client can read messages, process them, and only after successful processing, explicitly save the offset to continue from that point upon restart.

This approach requires careful state management to avoid duplication or data loss but offers full control over the message processing flow.